2018081 has 16 divisors (see below), whose sum is σ = 2313360. Its totient is φ = 1747200.

The previous prime is 2018077. The next prime is 2018111. The reversal of 2018081 is 1808102.

2018081 = 266² + 267² + ... + 291².

It can be written as a sum of positive squares in 8 ways, for example, as 99856 + 1918225 = 316^2 + 1385^2 .

It is not a de Polignac number, because 2018081 - 2² = 2018077 is a prime.

It is a super-2 number, since 2×2018081² = 8145301845122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2018021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19931 + ... + 20031.

It is an arithmetic number, because the mean of its divisors is an integer number (144585).

2^2018081 is an apocalyptic number.

It is an amenable number.

2018081 is a deficient number, since it is larger than the sum of its proper divisors (295279).

2018081 is a wasteful number, since it uses less digits than its factorization.

2018081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 2018081 is about 1420.5917780981. The cubic root of 2018081 is about 126.3706437527.

The spelling of 2018081 in words is "two million, eighteen thousand, eighty-one".